QTP Script Not saving to R:// Drive

Our team has Win 7 Machine and QTP 11.0. while saving our scripts to R:// Drive(Secured Location) QTP is not able to save it to that location. THat being said, its saving perfectly fine on Win XP Prof.

So the question is it the Win 7 patches thats causing this issue or something in QTP that needs to be tweaked and we have also contacted the Network people to see if they have tweaked anything on R Drive that might hinder in have Objects being saved in to The R Drive.